In Wonderland, Alice learned the power of mushrooms. On Earth's fecund soil, devotees as diverse as composer John Cage, Dr. Andrew Weil and scientist Paul Stamets have dedicated themselves to understanding the properties of thousands of varieties of mushrooms. They're not alone. Entire festivals attended by tens of thousands of people are dedicated to the celebration of fungal substances. In the feature documentary Fungi Film, Ron Mann, Canada's esteemed chronicler of alternative culture, casts his eye on a mushrooming phenomenon.